Property talk:P2931

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Encyclopedia of Triangle Centers ID
identifier for triangle centers used in the Encyclopedia of Triangle Centers, founded by Clark Kimberling

Applicable "stated in" value	Encyclopedia of Triangle Centers (Q1340177)
Data type	External identifier
Domain	According to this template: triangle center (Q778806) According to statements in the property: triangle center (Q778806) When possible, data should only be stored as statements
Allowed values	X\([1-9]\d*\)
Example	de Longchamps point (Q1807042) → X(20) incenter (Q10614739) → X(1)
Source	http://faculty.evansville.edu/ck6/encyclopedia/ETC.html
Lists	Items with the most statements of this property Count of items by number of statements (chart) Items with the most statements Items with the fewest statements Count of items by number of sitelinks (chart) Items with the most sitelinks Items with the most sitelinks, but no link to one Wikipedia (sample: Welsh Wikipedia, cywiki) Items with the fewest sitelinks Most linked wikis Items with the most identifier properties Items with no other external identifier Items with no other statements Most recently created items Items with novalue claims Items with unknown value claims Usage history (total) Usage history (main statement) Database reports/Constraint violations/P2931 Map Random list
Proposal discussion	Proposal discussion
Current uses	Total 44 Main statement 42 95.5% of uses Qualifier 2 4.5% of uses
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Type “triangle center (Q778806)”: item must contain property “instance of (P31)” with classes “triangle center (Q778806)” or their subclasses (defined using subclass of (P279)). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2931#Type Q778806, SPARQL

Single value: this property generally contains a single value. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2931#Single value, SPARQL

Distinct values: this property likely contains a value that is different from all other items. (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2931#Unique value, SPARQL (every item), SPARQL (by value)

Format “X\([1-9]\d*\)”: value must be formatted using this pattern (PCRE syntax). (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2931#Format, SPARQL

Scope is as main value (Q54828448), as reference (Q54828450): the property must be used by specified way only (Help)

List of violations of this constraint: Database reports/Constraint violations/P2931#Scope, hourly updated report, SPARQL

Allowed entity types are Wikibase item (Q29934200): the property may only be used on a certain entity type (Help)

Exceptions are possible as rare values may exist. Exceptions can be specified using exception to constraint (P2303).
List of violations of this constraint: Database reports/Constraint violations/P2931#Entity types